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Free global money tool · Reviewed 2026-09-22

Loan Comparison Calculator

Compare monthly payments and total interest for two fixed-rate loans over the same term.

Reviewed by Mohammad QasimMethod and limitations disclosed
Interactive calculatorYour values stay on this device
✓ Estimated result

Loan A has lower scheduled cost

1,435.74

Difference before lender fees and insurance
Loan A: 495.03/monthInterest 4,701.8
Loan B: 518.96/monthInterest 6,137.53
Personalised from your inputs

How this calculator helps

Compare monthly payments and total interest for two fixed-rate loans over the same term. It uses currency-neutral inputs so the same calculation can be used globally. The result explains the arithmetic and supporting figures instead of presenting a single unexplained number. Use it to explore choices and prepare questions, not as an approval, quotation, forecast or personal financial recommendation.

How to use it

  1. 1

    Enter the same amount and repayment term for a rate-only comparison.

  2. 2

    Enter Loan A's annual reducing-balance rate.

  3. 3

    Enter Loan B's comparable annual reducing-balance rate.

  4. 4

    Add lender fees separately before choosing the lower total cost.

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Formula and methodology

Payment = principal × monthly rate × (1 + rate)^payments ÷ ((1 + rate)^payments − 1).

The calculator applies the displayed arithmetic to the values entered on this device. It does not silently load a local tax rate, currency conversion or commercial assumption.

Worked calculation example

On a 25,000 five-year loan, comparing 7% with 9% shows both the monthly-payment difference and additional lifetime interest.

How to interpret your result

Compare monthly payments and total interest for two fixed-rate loans over the same term. Read the main result together with the supporting values rather than treating one number as a guarantee. The disclosed method is: Payment = principal × monthly rate × (1 + rate)^payments ÷ ((1 + rate)^payments − 1).

Input guide

1

Enter the same amount and repayment term for a rate-only comparison.

2

Enter Loan A's annual reducing-balance rate.

3

Enter Loan B's comparable annual reducing-balance rate.

Scenario comparison

ScenarioWhat it demonstrates
Worked baselineOn a 25,000 five-year loan, comparing 7% with 9% shows both the monthly-payment difference and additional lifetime interest.
Use comparable inputs checkKeep currency, monthly or annual periods, and before-tax or after-tax amounts consistent throughout the calculation.
Stress-test uncertainty stress testThe answer is sensitive to origination fees, effective rates, variable terms, insurance and prepayment rules. Test a less favourable scenario before relying on the estimate.

Common mistakes to avoid

  • Ignoring use comparable inputs: Keep currency, monthly or annual periods, and before-tax or after-tax amounts consistent throughout the calculation.
  • Overlooking stress-test uncertainty: The answer is sensitive to origination fees, effective rates, variable terms, insurance and prepayment rules. Test a less favourable scenario before relying on the estimate.
  • Failing to test check product terms: Provider fees, contractual definitions, payment timing, compounding and local regulation can change the real result.
How to verify this result

Reconcile the inputs with current statements and obtain confirmation from the relevant bank, FBR source or qualified adviser.

What can affect the result?

Use comparable inputs

Keep currency, monthly or annual periods, and before-tax or after-tax amounts consistent throughout the calculation.

Stress-test uncertainty

The answer is sensitive to origination fees, effective rates, variable terms, insurance and prepayment rules. Test a less favourable scenario before relying on the estimate.

Check product terms

Provider fees, contractual definitions, payment timing, compounding and local regulation can change the real result.

Review over time

Update the calculation when income, expenses, rates, balances or the planning date changes.

Limits of this estimate

This loan comparison calculation is an educational estimate, not financial, investment, credit, tax, accounting or legal advice. It cannot check whether an input is complete, determine local eligibility, predict returns, incorporate undisclosed fees or replace the terms supplied by a regulated provider. Verify important decisions using current statements, contractual documents and an appropriately qualified professional.

Important: Treat the result as a planning estimate. Confirm money, compliance, safety and contractual decisions with the relevant provider, authority or qualified professional.

Sources and review information

This tool uses standard published arithmetic and user-entered values; it does not embed a changing country-specific rate.Read our editorial and calculation policy →About the author and reviewer →

Frequently asked questions

Is the loan comparison calculator free?

Yes. The calculator is free, requires no account and processes the values in your browser.

Can I use dollars, euros, pounds or another currency?

Yes. Monetary calculations are currency-neutral. Use one currency consistently for every amount in the same calculation.

Does SolvePilot store my financial information?

No. The entered values are calculated on your device and are not submitted to a SolvePilot server.

Is this financial advice?

No. The result is an educational planning estimate based only on the values and assumptions you provide.

Why might the real result be different?

Actual outcomes can differ because of origination fees, effective rates, variable terms, insurance and prepayment rules. Confirm material decisions using current documents and a qualified professional where appropriate.

How should I compare scenarios?

Change one assumption at a time, keep the time periods and currency consistent, and include a conservative case rather than relying only on the most favourable result.